Posted by a reviewer on Amazon

The battery life is pretty good and the wide variety of ear tips seem to allow for a pretty big range of ear shape

Posted by a reviewer on Amazon

After two months of reasonable use 5 times a week with the same charging schedule needing to charge after 45 workouts the battery suddenly as of the day before yesterday is no longer holding a charge

Posted by a reviewer on Amazon

It doesnt get through one workout 45mins gives a low battery audio alert and then shuts down after about 3035 minutes

Posted by a reviewer on Amazon

So the batterymemory has completely failed

Posted by a reviewer on Amazon

I noticed after the first time it did this that the battery charging red led light flickers dimly for about 30 seconds after plugging in the charger which it never did before it used to go solid red immediately when the charger was plugged in and went off when charged

Posted by a reviewer on Amazon

The red led goes off after a longer charge time now and the battery is definitely not holding charge

Posted by a reviewer on Amazon

I will have to send the unit back as i dont believe the battery is changeable